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-Structure paper
タイトル | Molecular basis of global promoter sensing and nucleosome capture by the SWR1 chromatin remodeler. |
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ジャーナル・号・ページ | Cell, Year 2024 |
掲載日 | 2024年9月27日 |
著者 | Robert K Louder / Giho Park / Ziyang Ye / Justin S Cha / Anne M Gardner / Qin Lei / Anand Ranjan / Eva Höllmüller / Florian Stengel / B Franklin Pugh / Carl Wu / |
PubMed 要旨 | The SWR1 chromatin remodeling complex is recruited to +1 nucleosomes downstream of transcription start sites of eukaryotic promoters, where it exchanges histone H2A for the specialized variant H2A.Z. ...The SWR1 chromatin remodeling complex is recruited to +1 nucleosomes downstream of transcription start sites of eukaryotic promoters, where it exchanges histone H2A for the specialized variant H2A.Z. Here, we use cryoelectron microscopy (cryo-EM) to resolve the structural basis of the SWR1 interaction with free DNA, revealing a distinct open conformation of the Swr1 ATPase that enables sliding from accessible DNA to nucleosomes. A complete structural model of the SWR1-nucleosome complex illustrates critical roles for Swc2 and Swc3 subunits in oriented nucleosome engagement by SWR1. Moreover, an extended DNA-binding α helix within the Swc3 subunit enables sensing of nucleosome linker length and is essential for SWR1-promoter-specific recruitment and activity. The previously unresolved N-SWR1 subcomplex forms a flexible extended structure, enabling multivalent recognition of acetylated histone tails by reader domains to further direct SWR1 toward the +1 nucleosome. Altogether, our findings provide a generalizable mechanism for promoter-specific targeting of chromatin and transcription complexes. |
リンク | Cell / PubMed:39357520 |
手法 | EM (単粒子) |
解像度 | 3.3 - 7.3 Å |
構造データ | EMDB-44074, PDB-9b1d: EMDB-44075, PDB-9b1e: EMDB-44093: Cryo-EM structure of native SWR1, free complex (composite structure) EMDB-44106: Cryo-EM structure of native SWR1 bound to DNA (consensus map) EMDB-44107: RuvBL core from SWR1-DNA complex (focused refinement) EMDB-44108: Swr1 ATPase domain from SWR1-DNA complex (focused refinement) EMDB-44109: Arp6/Swc6 module from SWR1-DNA complex (focused refinement) EMDB-44110: Cryo-EM structure of native SWR1 bound to DNA (unmasked refinement filtered by local resolution) EMDB-44307: Cryo-EM structure of native SWR1 bound to nucleosome (consensus map filtered by local resolution) EMDB-44308: RuvBL-associated core from SWR1-nucleosome complex (focused refinement) EMDB-44309: Nucleosome and bound Swr1 ATPase from SWR1-nucleosome complex (focused refinement) EMDB-44310: Swc3-Swc2 subcomplex from SWR1-nucleosome complex (focused refinement) EMDB-44311: Cryo-EM structure of native SWR1, free complex (consensus map filtered by local resolution) EMDB-44312: RuvBL core from free SWR1 complex (focused refinement) EMDB-44313: Arp6/Swc6 module from free SWR1 complex (focused refinement) EMDB-46065: Cryo-EM structure of native SWR1 bound to DNA in the absence of nucleotide (composite structure) EMDB-46066: Cryo-EM structure of native SWR1 bound to DNA in the absence of nucleotide (consensus map) EMDB-46067: RuvBL core from SWR1(apo)-DNA complex (focused refinement) EMDB-46068: Arp6/Swc6 module from SWR1(apo)-DNA complex (focused refinement) EMDB-46069: Swr1 ATPase domain from SWR1(apo)-DNA complex (focused refinement) |
化合物 | ChemComp-AGS: ChemComp-MG: ChemComp-ZN: ChemComp-ADP: ChemComp-BEF: |
由来 |
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キーワード | GENE REGULATION / Chromatin Remodeler / Snf2 family ATPase / histone exchange / H2A.Z |